I am guilty of it too, online tests, while they are faster to do, they are not accurate, I'm ging back to the old way of downloading a file from a fast server.
Last night I put RWIN in and it read 59 times faster than 56K, so I thought WOW, I then downloaded a file (3 times) from a fast server, the highest I got was 60KB's, I live in FL and get higher online readings from CA than Atlanta, GA. I just can't put any faith in online tests. There are too many of them, some tell you how fast you download a page, the 500KB tests, which are to small, people think they are flying and there not, the only way to really tell is download a large file from fast server and see what you get.